Neil Warnock confirmed Cardiff had been given an extension for the first instalment of the transfer fee last Thursday, but Nantes has since taken the matter to the world's governing body.

A FIFA spokesperson told Omnisport: "We can confirm that we have received yesterday [Tuesday] evening a claim of a contractual nature from FC Nantes against Cardiff City in connection with the transfer of Emiliano Sala.

"We are looking into the matter and consequently we have no further comments at this stage."

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